1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
$$\alpha $$-particale consists of :
A
2 electrons, 2 protons and 2 neutrons
B
2 electrons and 4 protons only
C
2 protons only
D
2 protons and 2 neutrons only
2
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
Pick the wrong answer in the context with rainbow.
A
An observer can see a rainbow when his front is towards the sun.
B
Rainbow is a combined effect of dispersion refraction and reflection of sunlight.
C
When the light rays undergo two internal reflections in a water drop, a secondary rainbow is formed.
D
The order of colours is reversed in the secondary rainbow.
3
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
The unit of thermal conductivity is :
A
J m–1 K–1
B
W m K–1
C
J m K–1
D
W m–1 K–1
4
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
A soap bubble, having radius of 1 mm, is blown from a detergent solution having a surface tension of 2.5 $$ \times $$ 10–2 N/m. The pressure inside the bubble equals at a point Z0 below the free surface of water in a container. Taking g = 10 m/s2, density of water = 103 kg/m3, the value of Z0 is :
A
1 cm
B
10 cm
C
100 cm
D
0.5 cm